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AUSCERT External Security Bulletin Redistribution
ESB-2005.0332 -- FreeBSD-SA-05:05.cvs
Multiple vulnerabilities in CVS
26 April 2005
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AusCERT Security Bulletin Summary
---------------------------------
Product: cvs
Publisher: FreeBSD
Operating System: FreeBSD 5.x releases prior to 5.4-RELEASE
FreeBSD 4.x releases
UNIX variants
Impact: Execute Arbitrary Code/Commands
Denial of Service
Access: Remote/Unauthenticated
CVE Names: CAN-2005-0753
Original Bulletin:
ftp://ftp.freebsd.org/pub/FreeBSD/CERT/Advisories/FreeBSD-SA-05:05.cvs.asc
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FreeBSD-SA-05:05.cvs Security Advisory
The FreeBSD Project
Topic: Multiple vulnerabilities in CVS
Category: contrib
Module: cvs
Announced: 2005-04-22
Credits: Alen Zukich
Affects: All FreeBSD 4.x releases
All FreeBSD 5.x releases prior to 5.4-RELEASE
Corrected: 2005-04-22 18:01:04 UTC (RELENG_5, 5.4-STABLE)
2005-04-22 18:03:18 UTC (RELENG_5_4, 5.4-RELEASE)
2005-04-22 18:07:10 UTC (RELENG_5_3, 5.3-RELEASE-p10)
2005-04-22 18:13:30 UTC (RELENG_4, 4.11-STABLE)
2005-04-22 18:17:22 UTC (RELENG_4_11, 4.11-RELEASE-p4)
2005-04-22 18:16:15 UTC (RELENG_4_10, 4.10-RELEASE-p9)
CVE Name: CAN-2005-0753
For general information regarding FreeBSD Security Advisories,
including descriptions of the fields above, security branches, and the
following sections, please visit
<URL:http://www.freebsd.org/security/>.
I. Background
The Concurrent Versions System (CVS) is a version control system. It
may be used to access a repository locally, or to access a `remote
repository' using a number of different methods. When accessing a
remote repository, the target machine runs the CVS server to fulfill
client requests.
II. Problem Description
Multiple programming errors were found in CVS. In one case, variable
length strings are copied into a fixed length buffer without adequate
checks being made; other errors include NULL pointer dereferences,
possible use of uninitialized variables, and memory leaks.
III. Impact
CVS servers ("cvs server" or :pserver: modes) are affected by these
problems. The buffer overflow may potentially be exploited to execute
arbitrary code on the CVS server, either in the context of the
authenticated user or in the context of the CVS server, depending on
the access method used. The other errors may lead to a denial of
service.
IV. Workaround
No workaround is available for cvs servers; cvs clients are unaffected.
V. Solution
Perform one of the following:
1) Upgrade your vulnerable system to 4-STABLE or 5-STABLE, or to the
RELENG_5_3, RELENG_4_11, or RELENG_4_10 security branch
dated after the correction date.
2) To patch your present system:
The following patches have been verified to apply to FreeBSD 4.10,
4.11, and 5.3 systems.
a) Download the relevant patch from the location below, and verify the
detached PGP signature using your PGP utility.
[FreeBSD 4.10]
# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:05/cvs410.patch
# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:05/cvs410.patch.asc
[FreeBSD 4.11 and 5.3]
# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:05/cvs.patch
# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:05/cvs.patch.asc
b) Execute the following commands as root:
# cd /usr/src
# patch < /path/to/patch
# cd /usr/src/gnu/usr.bin/cvs
# make obj && make depend && make && make install
VI. Correction details
The following list contains the revision numbers of each file that was
corrected in FreeBSD.
Branch Revision
Path
- - -------------------------------------------------------------------------
RELENG_4
src/contrib/cvs/src/login.c 1.3.2.6
src/contrib/cvs/src/patch.c 1.1.1.7.2.7
src/contrib/cvs/src/rcs.c 1.19.2.7
RELENG_4_11
src/UPDATING 1.73.2.91.2.5
src/sys/conf/newvers.sh 1.44.2.39.2.8
src/contrib/cvs/src/login.c 1.3.2.5.2.1
src/contrib/cvs/src/patch.c 1.1.1.7.2.6.2.1
src/contrib/cvs/src/rcs.c 1.19.2.6.2.1
RELENG_4_10
src/UPDATING 1.73.2.90.2.10
src/sys/conf/newvers.sh 1.44.2.34.2.11
src/contrib/cvs/src/login.c 1.3.2.4.6.1
src/contrib/cvs/src/patch.c 1.1.1.7.2.5.6.1
src/contrib/cvs/src/rcs.c 1.19.2.5.6.1
RELENG_5
src/contrib/cvs/src/login.c 1.8.2.1
src/contrib/cvs/src/patch.c 1.1.1.13.2.1
src/contrib/cvs/src/rcs.c 1.27.2.1
RELENG_5_4
src/UPDATING 1.342.2.24.2.4
src/contrib/cvs/src/login.c 1.8.6.1
src/contrib/cvs/src/patch.c 1.1.1.13.6.1
src/contrib/cvs/src/rcs.c 1.27.6.1
RELENG_5_3
src/UPDATING 1.342.2.13.2.13
src/sys/conf/newvers.sh 1.62.2.15.2.15
src/contrib/cvs/src/login.c 1.8.4.1
src/contrib/cvs/src/patch.c 1.1.1.13.4.1
src/contrib/cvs/src/rcs.c 1.27.4.1
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VII. References
http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-0753
http://secunia.com/advisories/14976/
http://xforce.iss.net/xforce/xfdb/20148
The latest revision of this advisory is available at
ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-05:05.cvs.asc
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